Qnap MHZ UDIMM NAS Accessories RAM-16GDR4A1-UD-24, 16 GB, DDR4 SDRAM, 1.20 V, 2400 MHz, DDR4-2400/PC4-19200, Non-ECC, 288-pin, FF DIMM. The 16GB DDR4 2400 MHz UDIMM Memory Module from QNAP. Delivering speeds up to 2400 MHz, this module is a memory upgrade designed to improve your system's overall responsiveness and ability to handle data-intensive applications.